Chaos, Wildbreath has posted this as working code for others to use. He has a few tutorials/guides in this forum ("Tutorials & Other Helpful Info.").

Also, parentheses aren't needed there.

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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh

Instead of just [highlight], do [highlight=lua]. The closing tag is the same (just /highlight)

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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh